If, because of the nature of your work or development it falls outside the pre-determined standards of exempt or complying development then you will be required to lodge a development application with Council.
A Development Application (DA) is a formal request for permission to carry out "development". "Development" includes:
• the erection and/or alteration of a building or structure;
• any work in, over, or under land;
• the use of land or a building; and
• the subdivision of land
All such work requires a Development Application unless it can be considered as exempt or complying development.
Link to Development application process
Link to Development Assessment: A Guide
Link to e-planning